ITSMFT: FST opt. rerun clusterizer

[f3sch]

Allows to steer re-running the alpide clusterizers via ITSMFT_RECO_RERUN_CLUSTERIZER. Needed to run async ITS tracking properly on GPU with TPC.

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[f3sch]

@davidrohr I tested the fst on the epns with (produces the same tracks for ITS as with the cpu version in det. mode)

#! /bin/bash -x

rm -f /dev/shm/*fmq*;
export DISABLE_ROOT_OUTPUT=0
export GPUTYPE=HIP
export WORKFLOW_PARAMETERS=AOD
export WORKFLOW_DETECTORS=TPC,ITS,MFT
export WORKFLOW_DETECTORS_GPU=ITS,TPC
export SYNCMODE=0
export CTFINPUT=1
export ITSMFT_RECO_RERUN_CLUSTERIZER=1
export GLOBALDPLOPT="-b"
export NTIMEFRAMES=20
export ITSTRK_THREADS=20
export TIMEFRAME_RATE_LIMIT=2
export CONFIG_EXTRA_PROCESS_o2_its_reco_workflow=';ITSClustererParam.maxBCDiffToMaskBias=-10;ITSClustererParam.maxBCDiffToSquashBias=10;'
export INPUT_FILE_LIST=~/data/LHC24ar_559827/raw/o2_ctf_run00559827_orbit0057669824_tf0000903370_epn235.root
export CONFIG_EXTRA_PROCESS_o2_gpu_reco_workflow="GPU_global.deviceType=$GPUTYPE"
$O2_ROOT/prodtests/full-system-test/dpl-workflow.sh

[davidrohr]

Thx, generally fine with it. But we should be backward-compatible for a while, so we should keep supporting $DISABLE_DIGIT_CLUSTER_INPUT in a while.
We can remove the default DISABLE_DIGIT_CLUSTER_INPUT= but I would keep some ${$DISABLE_DIGIT_CLUSTER_INPUT:-} in the workflows for compatibility for some time.

[alibuild]

Error while checking build/O2/fullCI_slc9 for ad553b7 at 2025-07-24 17:37:

## sw/BUILD/O2-full-system-test-latest/log
command /sw/slc9_x86-64/O2/14541-slc9_x86-64-local1/prodtests/full-system-test/dpl-workflow.sh had nonzero exit code 1
[ERROR] invalid workflow in o2-its-reco-workflow: Found duplicate outputs ITS/CLUSTERSROF/0 in device its-stf-decoder (8) and ITS/CLUSTERSROF/0 in its-clusterer (18)

Full log here.

[f3sch]

The error is of course genuine but I don't know how reproduce it. I ran aliBuild build O2-full-system-test --defaults o2-epn --debug which goes successfully.

[f3sch]

now the check was successful... @davidrohr could the error be from a CI check started before I pushed again?

[davidrohr]

Well, I think the CI should restart when you update the PR, and it should not show old results after you pushed. But Giulio or Sergio should know if there can be a race condition.